Subject:  NSA/XSAPR/C1  General Quality Statement 
DataStreams:  nsaxsaprsurC1.00, nsaxsaprvptC1.a1, nsaxsaprppiC1.a1, nsaxsaprrhiC1.a1, nsaxsaprvptC1.00, nsaxsaprppiC1.00, nsaxsaprhsrhiC1.00

Description:  The XSAPR continues to undergo evaluation by the radar instrument mentors, VAP developers,
DQ Office, users, etc... As more indepth analysis and calibration studies take place,
we anticipate that new insights will be gained to increase the quality of the data and
decrease the uncertainty of the measurements. This is a continuous improvement process and
issues will be addressed as they are discovered.
As issues are discovered, attempts will be made to correct data that are currently in the
Archive. However, retrospective correction of errors due to calibration, signal
processing, component degradation and software bugs may not be possible for many of the data files.
This openended DQR is an advisory that some aspects of the data quality are not yet
known. It is also a request to users that find issues or questions with the data to contact
the ARM Radar Engineering & Operations Group as these issues occur so that they can be
investigated and corrected if necessary.
Known Issues Not Documented in Other DQRs
1. Due to the radome design, a radial pattern shows up in the data during times of
stratiform precipitation and longer term statistical analysis 
Suggestions:  
Measurements:  nsaxsaprppiC1.00:  Differential propagation phase shift(dp_phase_shift)
 Specific differential phase(diff_phase)
 Signal quality index(sig_qual_index)
 Attenuation corrected reflectivity(reflectivity_corr)
 Mean doppler velocity(mean_doppler_velocity)
 Differential reflectivity, clutter filtered(diff_reflectivity)
 Unfiltered reflectivity(reflectivity_unf)
 Range gate(gate)
 time_in_seconds_since_volume_start(time)
 Lag0 copolar correlation coefficient, clutter filtered(copol_coeff)
 Doppler spectral width, clutter filtered(doppler_spectral_width)
 reflectivity(reflectivity)
 Attenuation corrected differential reflectivity(diff_reflectivity_corr)
more
nsaxsaprvptC1.a1:  pulse_repetition_frequency(prt)
 Time corresponding to last radial in file(time_coverage_end)
 East longitude(longitude)
 Index of first ray in sweep, 0based(sweep_start_ray_index)
 data_volume_index_number(volume_number)
 time_in_seconds_since_volume_start(time)
 transmit_pulse_mode(prt_mode)
 Total power(total_power)
 Distance to the center of the corresponding range bin(range)
 Beam Elevation Angle(elevation)
 Azimuth of Radar Ray(azimuth)
 Sweep number, zerobased count(sweep_number)
 Unambiguous range(unambiguous_range)
 Differential reflectivity(differential_reflectivity)
 Doppler spectrum width(doppler_spectrum_width)
 data_volume_start_time_utc(time_coverage_start)
 Clutter filtered reflectivity in horizontal polarization(reflectivity_horizontal)
 Differential propagation phase shift(differential_phase)
 Mean doppler velocity(mean_doppler_velocity)
 altitude(altitude)
 Cross correlation ratio (RhoHV)(cross_correlation_ratio)
 Specific differential phase (KDP)(specific_differential_phase)
 Normalized coherent power(normalized_coherent_power)
 File status(file_status)
 Scan mode for sweep(sweep_mode)
 North latitude(latitude)
 Time index of last ray in sweep, 0based(sweep_end_ray_index)
 ray_target_fixed_angle(fixed_angle)
 Unambiguous Doppler velocity(nyquist_velocity)
more
nsaxsaprvptC1.00:  reflectivity(reflectivity)
 Mean doppler velocity(mean_doppler_velocity)
 time_in_seconds_since_volume_start(time)
 Differential propagation phase shift(dp_phase_shift)
 Range gate(gate)
 Lag0 copolar correlation coefficient, clutter filtered(copol_coeff)
 Signal quality index(sig_qual_index)
 Unfiltered reflectivity(reflectivity_unf)
 Specific differential phase(diff_phase)
 Attenuation corrected reflectivity(reflectivity_corr)
 Attenuation corrected differential reflectivity(diff_reflectivity_corr)
 Differential reflectivity, clutter filtered(diff_reflectivity)
 Doppler spectral width, clutter filtered(doppler_spectral_width)
more
nsaxsaprppiC1.a1:  ray_target_fixed_angle(fixed_angle)
 Time corresponding to last radial in file(time_coverage_end)
 Clutter filtered reflectivity in horizontal polarization(reflectivity_horizontal)
 Differential propagation phase shift(differential_phase)
 pulse_repetition_frequency(prt)
 File status(file_status)
 Sweep number, zerobased count(sweep_number)
 Differential reflectivity(differential_reflectivity)
 North latitude(latitude)
 Azimuth of Radar Ray(azimuth)
 Doppler spectrum width(doppler_spectrum_width)
 transmit_pulse_mode(prt_mode)
 data_volume_start_time_utc(time_coverage_start)
 data_volume_index_number(volume_number)
 East longitude(longitude)
 Beam Elevation Angle(elevation)
 Specific differential phase (KDP)(specific_differential_phase)
 Time index of last ray in sweep, 0based(sweep_end_ray_index)
 Scan mode for sweep(sweep_mode)
 Unambiguous range(unambiguous_range)
 Index of first ray in sweep, 0based(sweep_start_ray_index)
 Normalized coherent power(normalized_coherent_power)
 Total power(total_power)
 altitude(altitude)
 Mean doppler velocity(mean_doppler_velocity)
 Cross correlation ratio (RhoHV)(cross_correlation_ratio)
 time_in_seconds_since_volume_start(time)
 Unambiguous Doppler velocity(nyquist_velocity)
 Distance to the center of the corresponding range bin(range)
more
nsaxsaprrhiC1.a1:  Time index of last ray in sweep, 0based(sweep_end_ray_index)
 Total power(total_power)
 transmit_pulse_mode(prt_mode)
 Beam Elevation Angle(elevation)
 Time corresponding to last radial in file(time_coverage_end)
 Unambiguous Doppler velocity(nyquist_velocity)
 File status(file_status)
 data_volume_start_time_utc(time_coverage_start)
 Unambiguous range(unambiguous_range)
 time_in_seconds_since_volume_start(time)
 data_volume_index_number(volume_number)
 Scan mode for sweep(sweep_mode)
 Clutter filtered reflectivity in horizontal polarization(reflectivity_horizontal)
 Doppler spectrum width(doppler_spectrum_width)
 Normalized coherent power(normalized_coherent_power)
 Sweep number, zerobased count(sweep_number)
 Differential propagation phase shift(differential_phase)
 North latitude(latitude)
 altitude(altitude)
 Azimuth of Radar Ray(azimuth)
 Differential reflectivity(differential_reflectivity)
 Specific differential phase (KDP)(specific_differential_phase)
 pulse_repetition_frequency(prt)
 Distance to the center of the corresponding range bin(range)
 Mean doppler velocity(mean_doppler_velocity)
 East longitude(longitude)
 Cross correlation ratio (RhoHV)(cross_correlation_ratio)
 Index of first ray in sweep, 0based(sweep_start_ray_index)
 ray_target_fixed_angle(fixed_angle)
more
nsaxsaprhsrhiC1.00:  Signal quality index(sig_qual_index)
 Differential reflectivity, clutter filtered(diff_reflectivity)
 Unfiltered reflectivity(reflectivity_unf)
 Lag0 copolar correlation coefficient, clutter filtered(copol_coeff)
 Differential propagation phase shift(dp_phase_shift)
 Attenuation corrected differential reflectivity(diff_reflectivity_corr)
 reflectivity(reflectivity)
 Doppler spectral width, clutter filtered(doppler_spectral_width)
 Specific differential phase(diff_phase)
 time_in_seconds_since_volume_start(time)
 Range gate(gate)
 Mean doppler velocity(mean_doppler_velocity)
 Attenuation corrected reflectivity(reflectivity_corr)
more
nsaxsaprsurC1.00:  Attenuation corrected differential reflectivity(diff_reflectivity_corr)
 Attenuation corrected reflectivity(reflectivity_corr)
 Doppler spectral width, clutter filtered(doppler_spectral_width)
 Differential reflectivity, clutter filtered(diff_reflectivity)
 Specific differential phase(diff_phase)
 Unfiltered reflectivity(reflectivity_unf)
 Differential propagation phase shift(dp_phase_shift)
 time_in_seconds_since_volume_start(time)
 Range gate(gate)
 reflectivity(reflectivity)
 Signal quality index(sig_qual_index)
 Mean doppler velocity(mean_doppler_velocity)
 Lag0 copolar correlation coefficient, clutter filtered(copol_coeff)
more
